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/*
Copyright 2013 Michael Pavone
This file is part of BlastEm.
BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text.
*/
#include "wave.h"
#include <stddef.h>
#include <string.h>
int wave_init(FILE * f, uint32_t sample_rate, uint16_t bits_per_sample, uint16_t num_channels)
{
wave_header header;
memcpy(header.chunk.id, "RIFF", 4);
memcpy(header.chunk.format, "WAVE", 4);
header.chunk.size = 0; //This will be filled in later
memcpy(header.format_header.id, "fmt ", 4);
header.format_header.size = sizeof(wave_header) - (sizeof(header.chunk) + sizeof(header.data_header) + sizeof(header.format_header));
header.audio_format = 1;
header.num_channels = num_channels;
header.sample_rate = sample_rate;
header.byte_rate = sample_rate * num_channels * (bits_per_sample/8);
header.block_align = num_channels * (bits_per_sample/8);
header.bits_per_sample = bits_per_sample;
memcpy(header.data_header.id, "data", 4);
header.data_header.size = 0;//This will be filled in later;
return fwrite(&header, 1, sizeof(header), f) == sizeof(header);
}
int wave_finalize(FILE * f)
{
uint32_t size = ftell(f);
fseek(f, offsetof(wave_header, chunk.size), SEEK_SET);
size -= 8;
if (fwrite(&size, sizeof(size), 1, f) != sizeof(size)) {
fclose(f);
return 0;
}
fseek(f, offsetof(wave_header, data_header.size), SEEK_SET);
size -= 36;
if (fwrite(&size, sizeof(size), 1, f)) {
fclose(f);
return 0;
}
fclose(f);
return 1;
}
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